seed.cpp
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35 
38 #include "fcl/math/detail/seed.h"
39 
40 #include <chrono>
41 #include <mutex>
42 #include <random>
43 
44 namespace fcl
45 {
46 namespace detail
47 {
48 
49 //==============================================================================
51 {
53 }
54 
55 //==============================================================================
56 uint_fast32_t Seed::getUserSetSeed()
57 {
58  return getInstance().userSetSeed;
59 }
60 
61 //==============================================================================
62 void Seed::setUserSetSeed(uint_fast32_t seed)
63 {
64  getInstance().userSetSeed = seed;
65 }
66 
67 //==============================================================================
68 uint_fast32_t Seed::getFirstSeed()
69 {
70  // Compute the first seed to be used; this function should be called only once
71  static std::mutex fsLock;
72  std::unique_lock<std::mutex> slock(fsLock);
73 
75  return getInstance().firstSeedValue;
76 
77  if (getInstance().userSetSeed != 0)
78  {
80  }
81  else
82  {
84  = static_cast<std::uint_fast32_t>(
85  std::chrono::duration_cast<std::chrono::microseconds>(
87  - std::chrono::system_clock::time_point()).count());
88  }
89 
91 
92  return getInstance().firstSeedValue;
93 }
94 
95 //==============================================================================
96 uint_fast32_t Seed::getNextSeed()
97 {
98  static std::mutex rngMutex;
99  std::unique_lock<std::mutex> slock(rngMutex);
100  static std::ranlux24_base sGen;
101  static std::uniform_int_distribution<> sDist(1, 1000000000);
102 
103  return sDist(sGen);
104 }
105 
106 //==============================================================================
107 Seed::Seed() : userSetSeed(0), firstSeedGenerated(false), firstSeedValue(0)
108 {
109  // Do nothing
110 }
111 
112 //==============================================================================
114 {
115  static Seed seed;
116 
117  return seed;
118 }
119 
120 } // namespace detail
121 } // namespace fcl
fcl::detail::Seed::setUserSetSeed
static void setUserSetSeed(std::uint_fast32_t seed)
Definition: seed.cpp:62
fcl::detail::Seed::isFirstSeedGenerated
static bool isFirstSeedGenerated()
Definition: seed.cpp:50
fcl::detail::Seed::getUserSetSeed
static std::uint_fast32_t getUserSetSeed()
Definition: seed.cpp:56
fcl::detail::Seed::getNextSeed
static std::uint_fast32_t getNextSeed()
Definition: seed.cpp:96
fcl::detail::Seed::userSetSeed
std::uint_fast32_t userSetSeed
The seed the user asked for (cannot be 0)
Definition: seed.h:73
fcl::detail::Seed::Seed
Seed()
Definition: seed.cpp:107
fcl::detail::Seed::getFirstSeed
static std::uint_fast32_t getFirstSeed()
Definition: seed.cpp:68
fcl::detail::Seed
Definition: seed.h:49
fcl::detail::Seed::firstSeedValue
std::uint_fast32_t firstSeedValue
The value of the first seed.
Definition: seed.h:79
seed.h
fcl::time::now
FCL_EXPORT point now(void)
Get the current time point.
Definition: time.cpp:47
fcl::detail::Seed::getInstance
static Seed & getInstance()
Definition: seed.cpp:113
fcl
Main namespace.
Definition: broadphase_bruteforce-inl.h:45
fcl::detail::Seed::firstSeedGenerated
bool firstSeedGenerated
Flag indicating whether the first seed has already been generated or not.
Definition: seed.h:76


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autogenerated on Sat Sep 11 2021 02:37:42